This man can descend 20meters (65feet) to the sea floor where hearts slows down to 30beats per minute while squezzing the lung to 1/3 of its initial volume. Even without weights, he is negatively bouyant enough to strive across the bottom of the sea as if like hunting on land, 2 1/2 minutes of hunting under pressure. He can still manage to stay as long as 5 minutes! - indeed a superhuman.
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